Definition of sinister
1
: singularly evil or productive of evil
2
: accompanied by or leading to disaster
3
: presaging ill fortune or trouble
4a
: of, relating to, or situated to the left or on the left side of something
especially
: being or relating to the side of a heraldic shield at the left of the person bearing it
b
: of ill omen by reason of being on the left
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Merriam-Webster unabridged
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Time Traveler for sinister
The first known use of sinister was in the 15th century
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